html, body {
    height: 100%;
}


.bg {
    background-image: url('img/bg3.jpg');
    background-size: cover;
    background-repeat: repeat-y;
    background-attachment: fixed;
}

.form_container {
    padding: 30px;
    width: 100%;
    max-width: 400px;
    margin: auto;
}